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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f8ce708d8837191a0ae473577c4b2152dac4bbdbb7057c23d82c636935e665' 
  AND token = 'ziP2SCROjX0UxorZj/AK6UDRg4UYkoOGrYtVj3J6NOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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