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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2200a6d969e5055ebdf174be9a1896d212ebe62738c2dc689e9e213464853d9' 
  AND token = 'yTURd7OZGGi1m9MBPQEXSZYzRuSPBIwK3VLw13AfHQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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