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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e409da48b331f999783e9804a8697493ebf4d41ca21f911af36b3fffd93ec7' 
  AND token = 'ujkWHLPwaBPUkysGsO0zc/8uVPbAHVvaoDe4S1GIHGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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