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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13112ec621b374c944f5e5cb5553ff08ec48bb92dbf4272919cc9d9479bf447' 
  AND token = 'qnCiA9y9lzzTF7bWUPAampPWJAaioKIkLS3/dei4Phc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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