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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f01f1f0f65231a264bc0d4c5dc13af14a6b5243ca9089bb0531d2c0c10bbb46' 
  AND token = 'Sn4+MVgsasoZTOl3QEQLg+b/WRodI/HAdBHBuarOoNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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