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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13813c3e4263c4b44a3be5c2d6e9632136599cfc5b09993e5bd9934dcfb83904' 
  AND token = 'w8tFTPnxTNLjLaUkOgaG7e3kja6rqBcfOunAoj88A0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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