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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2fa185d2b507d173483aed694fea1b3ed36caa4628c7e849f5ae67b10d580f' 
  AND token = 'jS1BtT+tXWjWUk8qH8xxZxHo64ThearBt6irjvkMcUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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