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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbf60e8b57e1f06229def4ac0d08dd702e67a06f736e1b2bf52c2ba9c4143de' 
  AND token = 'uFpah0aocog1p7TfGZ1smNfBp62OkY8ZEMSAfY8nBp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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