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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613ca9de01ff6f7ea5c7bbe1f8a9fc4f2850f580bb0e6f80d26e5eb333a640c0' 
  AND token = 'Yg8oFX8UM9VB6P7A9taPGz5zRrurDIscUX2s10nHbuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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