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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f082b8e3024cfba3c5ce0ba781a202a8e767410d54f0cda2a77b1e72c975ec' 
  AND token = 'de3yNLmaToKJOjNApiNLN7DJbHx+8c9AlPMgPk7KSmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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