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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02a2694a48b779b3a3c96cf545b8c4680751ab6d806c58cbd4e99fb8d340a9b' 
  AND token = 'R896GRXrjZ++2pc0VIlR9vMq8+9kDgp5K7v9CK1s23o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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