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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c045fad6c0e0c1b14c24bfb0c9a0ecf26ef6c7f4b5a08cba63ab5c9fbbf48ab7' 
  AND token = 'O7Aso5FgRKXkTGqLtN4Od38JTMRBfgxqECrlk5eLAT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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