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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87922fdeda4d6e8ee0dcf8b6b125bf9c69fa7e3a6a1bb10586b9b0b1aec6ba9e' 
  AND token = 'ggZIGpaNhyN59smsl8NhfknAZBUt37lefziULFGkl6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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