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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2dad8acb3a8e011c3b0c728ad5efaf3872f24c33b645181b1f4e2b1b0df7e1c' 
  AND token = 'gS64EfXvyS9KqsG8B/HMitdicoDRtuUVvyaeojQ3sdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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