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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa8a9fe984267869b8c5c580eccd76732ec90605f35b288d737e04900db8166' 
  AND token = 'LEE0Qv8axXVEfe6iRRK3a6+5/3ez5JceDPi8xtJtc6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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