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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67dc0eb966dc41a86e47a16af6963dd47e0c568be67b30f712b4568c427197cd' 
  AND token = 'xvd9zWO3HLv2ih5nc22xEBTmzxpwAkE6hB3sWQoAgSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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