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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d81c2a3146d22f2139481827ead49931b230b20b628622c11a31cdd815b1913' 
  AND token = 'QiJiwCo6GscNjbNx0d41qg7/lwjPiHiMDbYPum6zia0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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