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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6e9e3add310c29eb0725b97cb54dfc986756d3b2199d3c36ee1ef8e4c824d1' 
  AND token = 'oUkuFywM/6aLL9GkU1WBEdCM/mkv+qGQ63Kw9VMTqM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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