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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c9015a274e9dfea4953070d29a46e9195ccf080d47d6be9a1729bff1e51520' 
  AND token = 'c6q3jSpsnO0H7klFHQNKSnepv5QXpWe5WiKwDkUtSh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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