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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690d4a471a0a11004f6d2942b6ed985b93bb32e12529fdd223cc723ee5bcdf2d' 
  AND token = 'bBAaX8KnXmja/iCok/UwUGVVViV13pCfVJdvsNqewd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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