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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155c63f140a1058aac0acad38a608b0fcdae6b2606e12a68944050c1f473be38' 
  AND token = 'AJ/OUo+1YPCLIhT13hdjw1LEyz8BbyY7f4N/etB3AT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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