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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71f1700cc2656148e7d726de4b6be2de74447401f070e67782ce070e1e2f1f1' 
  AND token = '2iubB4FCMW06xN3/SLRAGJySnKcQ3QvBjP/5jhJjhuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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