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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4a3f80979103929beb739529363129936f3ba15150ce50bb9f64a930d81817' 
  AND token = 'f6dO+fMLluJ+RwN0J5lb509kGx8R4TQKp4gC4QPOn7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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