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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5a89e57da05f602106b815cb7f5cdfdb1419823c5ba9deaf56faa9077e9eff' 
  AND token = 'ZYDcqf9xx8Z8VhnGGoLELCRnwRSOqrf1riqfpnpumIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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