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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29056a0491c92cef62ab7e131af22bd2e93e0bd6834fd3ebf9feba47a78d59ad' 
  AND token = 'Xp86NXEVmDME138Glbsd9RLVQF6W16Uao6mOtumU7Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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