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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af39e86954c432d979801293c70a221fd310456c0acb153d21f6d6d4e23fa0fd' 
  AND token = '4x1zb6EDdfOrESY0HphJIjXRxhbFt/MO5XwKwmKt2ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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