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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eabbeb4ecb2c8c1305c12590d2b22079800a4d88ac93ce0b9d3eafad0399a1df' 
  AND token = 'df11gYCakd3OFqLViG27b2+gIYQcFufhYbY6s1kko24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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