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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2aa5af66ac29a61c7248a599c3f194ae0dcd2ddb3aac35c2b1c1c99817b7db7' 
  AND token = 'MkCsdCuelca2A/NFcZaXiPKRlQv7u6qvz1t7mT5dFv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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