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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba07730aaec9b19feb259ec3de665c26af147b75624efc70278d407a4677086' 
  AND token = 'MrC3u9wTTZ2ItNv1FPsNJL4YtQOdMS1Kc6RJyqAIiOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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