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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579318ed17b55657f154ffd60ac3bdf04c46627f807cf65cf7ecf6645ba64b6a' 
  AND token = 'CKdKZI2pCDZoWehAIzshJBfk9cDC4Uyb67m6n8LuuLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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