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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08259a684f9966b2ec421aa3753b9b47caaddc098c0971ef8a9586e9a4a849de' 
  AND token = 'dDlh0If5LA7nM3QdlDYsKSOwJgSQP15m6WTX0kQUGPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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