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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ddd92449fc7dc213b1f5844af8e63794a540f7491cf0b38307fb5d20e62080d' 
  AND token = 'cvm7VW7FVOFLvuVvSHoCEHb89lvpQdCgo0ehTgn3pPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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