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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '654896e88bcc679da856041749b162dcbe9dcbdc48660ce883859918893661db' 
  AND token = '8agKjWsWn7Rwz54Mt0gK+2T/EStEjesIWdThq9PONd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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