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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4828da45ba26c3e5252396218f46993073e67b87808a3df04b7542cda83abc7' 
  AND token = 'qhotseDADSei6tvH2Hkdb/sK/UNIQEF6DquK9UASRoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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