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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c32dd70c07161646ee06fde6047132b0411dedb57897e7701fe656169ae5d1' 
  AND token = 'S0AhtnRUktdUCii+bTR7qwc1Gsuqe/HZY2DjmOOkOlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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