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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bb5582f39ddbaa6fd92edb84703cf82d8afdf6f500410ea8a55125d665486b' 
  AND token = 'uqpT+0f66E8gk23DXIvwRH8bLUnzK1s8nTiFsKrK3cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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