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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39cf1d60ce5fc58da89f3c3e13e2703cec6b3a5f48f34960ada87954dfff0866' 
  AND token = 'bSKOOce96SV9nuChnfX4iwIlxyIwAClDt0nwiWvkixo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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