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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cbd418848993b0722b60c4b3d96f898d5e38eecbe771f1d66ad6db6143c06e' 
  AND token = 'z3SC57FzIwNwiccRgmi60PH9tBYkEgOn0aFgMY7PD+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}