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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b027831091aa599d1d51b1f8a5d8817de780010e0c56c307d4cbe5fc2914d6a' 
  AND token = 'tAiF0kgNlhJ+zrq0/yDUrZEEbfbepITIIuJa8mFmd1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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