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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565e576dfcba618149c33fca2f755a55f1bc59b131328d2475a4c8cf790a1040' 
  AND token = 'PL6+GxKChXwE8BBeF9I6URzCrexE6tz//haSzBeU1TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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