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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3bcd7bd5406ee6566f7f1ec59b785d263e92427822b446e434525bdf3f78a2' 
  AND token = '3bv4IKk331zpQWoeHuL1qlNd0IuMkraBzFOBHcnPej0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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