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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddeb3128278e90e39da2d593c2543b8df6e54e4986914db8c8449b5e82985a26' 
  AND token = 'Tb+C8byPLpZDWNwrY+zw4FW30RM2u/Ar9qVznGN6xEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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