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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd209b8b39ef83917538192520a166e88781a4b4528b031daf4a1b6faf43af12f' 
  AND token = 'SYDww4foY8JlyDtm6Q5jaA3I0et0KjHbQN0N6+vSfvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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