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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4369cc0b88c507a5259fe88cffad16ab16d9608a895c8635a952bc497b6973b7' 
  AND token = 'dMoFAz5TvYFnxb3kysf6uHVSpk7MngnrtOluTaUIia4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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