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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a423cc6620decd34d75f9f30ea13efe1e53b8dcf9c704f6c76702070dec763' 
  AND token = 'vBmaE5nlz2sSAF01ftfnMuwZwhT7BfK/Dmm8WS3GEr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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