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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623e2d9a7de02297a8851798ca44810d2827f733b01085955413313871ec8f2b' 
  AND token = 'QVejljV6atuMjRLvTvOgt9DCSCvJLDulUZ2tDf6UmDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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