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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb729f136c6beae439e403ef657f21f83d18e4f4a906ca176f5d7b6e8b45ec12' 
  AND token = 'Nb61AT8aA3aET78mlPP81rItIBbMgMoECpRv/RTVErU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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