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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc53e7630f9c35eac105749fd8b9024d600a89201e0da495d0d36ce05f73c26' 
  AND token = 'MASN+W6GiVUOK4Cmw50N73D0wIMg21oMMz2DX5D7/Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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