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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f946113264862de2182361719bd2cc2325632c0a6e313446b309aaac4496958f' 
  AND token = 'FmSi4meaAUiow9vYsXkRCf8HZhiGkZ8La4J9CCVyjgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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