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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20fe1954b162a321b83b4342123fe3384baac0efae008b9d041fae8b113150b0' 
  AND token = 'kaQxvV+RRYfXbkhP9pMe8Mki7ItxnFrpr81bxJ5Y7ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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