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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9f5327ef401341a09b7a273513b264ba21bf287fdc71ffa80a45f418c21775' 
  AND token = 'r8ZdiaE/2eGl5oD4P60BzxVwIoXqlQ3WnNwM2pNnVSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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