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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d1b75ac87ba95b821fbbae5cbeb32f4c40acc0e0b2df07e827132680b80b21' 
  AND token = 'wZL2jVM/Up77kgXHx+QY3qWBukno5QJo0D8aoy0lexA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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