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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899d67abc3f7cb1754666f188bb89aa014522e6c97254f40cab8824f9c730e45' 
  AND token = 'E0pnOEHMiv8hwMGH7O511ei4Kl9pXwAD8WdThNaphk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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