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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531c5711b6a4a5f3040adadb6dada63babb0160253e4ccd19f034d2878ae2912' 
  AND token = '0m6fHAO8x/q5aUENRkjyN6inc8AjWLRBBlxqcxX2x0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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