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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a318d36f1cb0ee56d5e667ec0be669bfae0e8599d848b8db4825688e5f8cc4ed' 
  AND token = 'MAIPdmX4WymwIGhVM/4U97FLdmr+/p1vIXdPyvzuOf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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