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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3b4aff2a7015beceb784fd0fe3ec87774436a653d87eb599617d8d25448939' 
  AND token = 'cdWXvj23G1taGDRKQuoJkxki5QYDBd29kF5r9bAvNNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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